You can go far by just focusing on things like balance, mana curve, and card advantage
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So you can sacrifice the copy to the original if you have some extra mana for even more value
As you calculate, keep an eye on your opponent's Life, your own Life, the presence of opposing Blockers, and how many Characters you have, and use whichever the situation calls for.
Sure, Parallel Lives and Anointed Procession are cute, but what happens once that non-aura Enchantment is out of the yard and has already become two weird 3/3 Black Zombie creatures that are also somehow also Deadbridge Chants
Above all, Paradox Rift is noteworthy for the sheer number of the relatively high value Illustration Rare Pokemon cards you can collect from packs